A PLANTATION PUZZLE

A man had a square plantation of forty-nine trees, but, as will be seen by the omissions in the illustration, four trees were blown down and removed. He now wants to cut down all the remainder except ten trees, which are to be so left that they shall form five straight rows with four trees in every row. Which are the ten trees that he must leave?

Combinatorics -> Combinatorial Geometry -> Grid Paper Geometry / Lattice Geometry

Sources:

Amusements in Mathematics, Henry Ernest Dudeney Question 208

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